| Summary: | Scaled-up image preview in viewer window becomes blurry when moved from high DPI scaled screen to lower DPI unscaled screen | ||
|---|---|---|---|
| Product: | [Applications] Spectacle | Reporter: | Nate Graham <nate> |
| Component: | General | Assignee: | Noah Davis <noahadvs> |
| Status: | CONFIRMED --- | ||
| Severity: | minor | CC: | kde |
| Priority: | NOR | Keywords: | multiscreen |
| Version First Reported In: | git-master | ||
| Target Milestone: | --- | ||
| Platform: | Other | ||
| OS: | Linux | ||
| Latest Commit: | Version Fixed In: | ||
| Sentry Crash Report: | |||
| Attachments: |
Viewer window on high dpi scaled screen: nice clear image
Viewer window on lower dpi unscaled screen: blurry image 175% screen 100% screen |
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Created attachment 181901 [details]
Viewer window on lower dpi unscaled screen: blurry image
If you compare both screenshots in an image viewer by scaling them to the same size and rapidly switching between them, you'll see what I mean. A *little bit* of blurriness in the UI is expected, since the screen has a lower DPI. But the amount of blurriness shown by the preview is far greater, and that's what's unexpected. Created attachment 181908 [details]
175% screen
When I try to do it myself, it looks more like there's a degree of unsmoothed downscaling rather than blurring.
Created attachment 181909 [details]
100% screen
Yeah, that's more or less what I see too. |
Created attachment 181900 [details] Viewer window on high dpi scaled screen: nice clear image STEPS TO REPRODUCE 1. Have two screens, one with lower DPI at 100% scale (in my case 23" 2560@1440), and one with higher DPI set to a higher scale (in my case 14" 2880x1800@175%) 2. Use Spectacle to take a small-ish Rectangular Region screenshot of under 400x400px on the higher DPI screen 3. Drag the viewer window to the other window OBSERVED RESULT The image preview becomes blurry EXPECTED RESULT The image preview remains sharp, because the screenshot size is smaller than the size of the viewer window, so there are definitely be enough physical pixels to display it scaled up without becoming blurry SOFTWARE/OS VERSIONS Operating System: Fedora Linux 42 KDE Plasma Version: 6.4.80 KDE Frameworks Version: 6.15.0 Qt Version: 6.9.0 Kernel Version: 6.14.8-300.fc42.x86_64 (64-bit) Graphics Platform: Wayland Processors: 16 × AMD Ryzen 7 7840U w/ Radeon™ 780M Graphics Memory: 16 GiB of RAM (14.9 GiB usable) Graphics Processor: AMD Radeon 780M